Energy Efficiency = changing current devices so they 1) do more useful work 2) not converting into low-quality(heat) 84% of all commercial energy used is wasted ~40% through entropy ~40% by inefficient methodology Reduces dependency on oil imports Lowers cost/increases net energy yields Reduces pollution by reducing emissions of NOx, SO 2, CO 2 BENEFITS? % of total energy that does useful work Common Inefficient Devices: Incandescent Bulbs Combustion Engines

80-90% of our energy comes from fossil fuels Oil age rapidly changing to less damaging fuel sources Fossil fuels have: Political support & solid infrastructure Alternative Energy – 1)Renewable Energy – solar, wind, hydropower, biomass** 2)Non-renewable Energy – nuclear & geothermal 3-5% = hydropower 7-10% = nuclear power US Consumption

Fuel Cell = 60% Fluorescent Lt = 22% Incandescent Lt = 5% Steam Turbine = 45% Internal Comb. Eng. = 5-10% Nuclear Power = 14% Coal burning PP = 34%  Keep # of steps in energy conversion low  INSULATION!  Congeneration (industry)- using waste heat  (80% efficient, reduce emissions of CO 2 )  Replace inefficient motors  Switching to high efficient lighting